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Image Trace: Shapes, and corners whose pixel is mostly outside the shape

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Shapes (params `shapes`, a checkbox in the panel; off unless asked for): a filled
outline that is a circle, an ellipse, a rectangle or a regular polygon comes out
as that live shape. A shape is only made when every point of the traced outline
lies within 0.5 px (0.2% of the shape's size, if more) of it; an ellipse whose
radii differ by less than twice that is a circle of its area.

The outline before fitting: a corner's own pixel no longer pulls the two edges
that meet there, and a one-pixel step between two long edges is the corner where
they meet. Sharp corners kept: Default 69% -> 76%, the colour presets 86% -> 91%.

The harness gains plain-shape inputs and "shapes %".
This commit is contained in:
bflatastic
2026-10-13 10:25:05 +07:00
parent f0f3cb4eb1
commit 9ca74ac011
12 changed files with 900 additions and 322 deletions
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crates/ui-egui/src/panels/image_trace.rs
+6
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@@ -360,6 +360,12 @@ pub fn show(app: &mut VectorcraftApp, ui: &mut Ui) {
st.preset = "Custom".into();
retrace = true;
}
let shapes = st.params["shapes"].as_bool().unwrap_or(false);
if widgets::check(ui, tl!("Shapes"), shapes, true) {
st.params["shapes"] = json!(!shapes);
st.preset = "Custom".into();
retrace = true;
}
// Ignore Color: white, unless another colour is picked.
ui.horizontal(|ui| {
let on = st.params["ignoreWhite"].as_bool().unwrap_or(false);